El Rosario Weather in September
What's the weather like in El Rosario (Carazo) in September 2025?
The climate in El Rosario during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in El Rosario and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 22°C (72°F) is normal.
| Daytime temperature | 30.5°C 86.8°F |
|---|---|
| Nightly temperature | 22.2°C 71.9°F |
| Average temperature | 26.3°C 79.3°F |
| Daily sunshine | 6.9 hrs |
| Avg rainfall | 267 mm 10.5 ins |
| Rainy days | 24 days |
| Sea temperature | 28.9°C 84°F |
| Humidity | 80% |
| Windspeed | 5.8kph 4 mph |
On average September is the 5th wettest month of the year in El Rosario with around 267mm 10.5 inches of rain making it a very wet time to visit. This rainfall is typically spread over 24 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.9 hours of sunshine per day.
September temperatures in El Rosario
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in El Rosario in September 2025.
Other monthly averages
Best places to visit in September
El Rosario weather stats
| Hottest month: | April | 33.2°C 91.8°F |
|---|---|---|
| Driest month: | March | 26mm 1ins |
| Sunniest month: | February | 9.6hrs |
| Coldest month: | December | 30.1°C 86.2°F |
| Wettest month: | July | 324mm 12.8ins |
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